Review on YONGNUO YN660 Speedlite: Versatile Wireless Manual Flash with GN66 Power for Canon Nikon Pentax Olympus by Nicole Walker

I liked them at first but generally they disappointed me and gave me a big headache in the field. They just suddenly stop working and never work again. I have 3 of these and only 1 works. I need 2 to work for the work I do and I'm just so pissed that they just don't last long because they're great value for money and I LOVE the wireless functionality. But I'm just sad that I can't use them anymore. Hurts business.